Vibratory break for induction coils



July 6,1926. 4 1,591,696-

Z. BISSKY VIBRATORY BREAK FOR INDUCTION COILS m-mm Filed July 16. 1924 N l V hwE/vne:

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Patented July 6, 1926 PATENT OFFICE.

ZACHARIE BISSKY, OF GENEVA, SWITZERLAND.

VIBRA'I'ORY BREAK FOR INDUCTION COILS.

Application filed July 16, 1924, Serial No. 726,351, and in Switzerland July 31, 1923. Renewed May This invention relates to new and useful improvements in induction coils and more particularly to a vibratory break for induction coils, for example for induction coils adapted to produce currents having, the nature .and frequency necessary for auscultation and medical treatment.

Known vibratory breaks are in existence wherein a contact arrangement is provided with a single contact mounted on a movable armature and giving a make and break of the primary circuit of the coil by the oscillation of the armature. These are quite useful when the number of interruptions in unity of time varies within given limits, but are of difiicult and delicate application when it is necessary to obtain a frequency of interruption higher than the upper limit above mentioned. 1 i I The object of the invention is to provide a vibratory break which carries a contact arrangement producing a number of interruptions of the, primary circuit of the induction coil which is a multiple of the number of oscillations of the movable armature thereof.

Under these conditions a considerably higher number of interruptions can be obtained as is necessary for the needs otmedi cal treatments, without departing from the normal limits between which the number of oscillations of the armature of the break can vary. v

The accompanying drawing shows by way of example two forms of construction of the device.

Figure l is a diagrammatic view of one form of construction of the coil to which the break is applied. i

Figures 2 and 3 are an elevation and plan view respectively of this form of construction.

Figure 4; a plan of a second form of construction. a v

According to Fig. 1 a source of current a continuous, pulsatory, alternating or the like feeds the primary 1) of the induction coil Z)'-h by means of, on the one hand a conductor c, and on the other hand a conductor d, the contact arrangement 6 of the first form of construction, a conductor 7'' and an adjusting rheostat g, The secondary oi the coil belt is represented by h.

This form of construction includes iian electromagnet i (see also Figs. 2 and 3) interposed horizontally in one of the branches of a frame 2 of a. C-shape which is made of magnetic material and of which the middle branch carries an element 9' alsov of magnetic material. To the element j is attached a flat spring la 01 steel carrying the armature Z which thus arranged at the free extremity of the electron'iagnet The armature Z is of L-shape of whichthe lower branch is held normally by the spring is at a small distance from the element j but strikes against this element when limiting the movement of the armature towards the left on its attraction by It is arranged further at a relativelysmall distance from thecore of the electroi'nagnet 'z'rso that the gap is not too great and the reluctance of the magnetic circuit is not too high. It is provided with a rod m on which slides a weightv n provided with a fixing screw 0 and is submitted to the action of a spring 3 attached to a screw as carried by the arm w of the frame a which allows the variation of the period of oscillation of this armature. By actuation of the weight n and spring 3 the duration of each oscillation of Z can be varied, the natural duration of which is governed by the weight of the armature and its component parts and by the rigidity of the spring is. The movement of the armature must not however vary with? in great limits it it is desired to have a regular spacing of the interruptions.

The armature carries an elastic conductive strip 10 forming part of the contact arrangement e and carrying at one of its ends a contact g adapted to touch when at rest a fixed contact 0 and at the other end two contacts 8, t, the contact 23 when at restcontacting with a fixed contact '0 .and the other s, when the armature Z is attracted, touching a fixed contact a. The three contacts r, u, o are formed by screws and are therefore adjustable. The conductor (Z is connected in a permanent manner to the strip j) which is not shown in the drawing. The contacts a and o are both connected to the conductor 7.

The circuit of the electromagnet z' is fed by the source a and passes through the con ductor c, a conductor 11 fixed andniovablc contacts Q, r, the strip 2) and conductor (6.

The operation of this form of construction is as follows:

Supposing the arn'iaturc Z is in the position indicated in Fig. 1.

The circuit of the prin'iary 7) of the coil 6-70, is closed through;

Source a, conductor c, nrimarv 7), rheostat g, conductor f, contacts 4;, t, strip 7), conductor (Z, source a.

Further the circuit of the electromagnct 2' is also closed through. I

Source a, conductor electroimignet z, conductor y, contacts 9, r, strip 29, conductor (Z, source a.

This electroinagnet i attracts the armature Z breaking the circuits of i and Z) h through Q-9' and t o but reclosing the circut b/t through su. The arn'iature Z thus freed returns reopens again the circuit of bh through su and recloses it through to thus forming again the circuit of a through g-r; the same cycle of operations recommences.

From the above it will be seen that there are two interruptions of the circuit of the primary circuit 6 for one complete oscillation of the armature Z.

In the second form of construction (Fig.

- 4), which allows four interruptions of the primary current 7) to be made through a complete oscillation of the armature Z, the contacts uv adapted to touch the contacts st, of the strip 72, are shorter and more rigid than formerly and are not normally fixed vbut are on the contrary carried each by resilient and conductor strip 1 and 2 respectively. The two strips 1 and 2 are fixed to an isolated support 3 and each carry a contact at or 5 adapted to contact with a contact (3 or 7 carried by a further isolated support 8 connected to the conductor 7 of Fig. 1.

The operation of thesecond form of construction takes place as follows.

In the position indicated in Fig. i the contact 9 of the strip 29 touches the contact '2" whenever the circuit of the electromagnet i is closed; the two contacts s-t on the con trary do no touch the contacts uo until this primary circuit Z) is opened.

I-n consequence of the attraction exerted on the armature Z and of its movement towards the left the contact (7 leaves the con tact r and opens the circuit of the electromagnet 2'.

On the other hand the contact 8 of the strip p comes into contact with contact a of the strip 1. There is firstly a closing of the circuit of the primary 5 since 19 touches a and as 4 is still in contact with 6, then opening of the circuit between l and 6 be cause lis withdrawn from 6.

lVhen the armature returns and is displaced from left to right there is in the first place closing of the circuit because 8 is still in contact with a and as at again returns into contact with 6 and in the second place opening of the circuit between 8 and u on account of the fact that s is separated from u and in the third place closing of the circuit because 25 comes in contact with o whilst 5 and 7 are still in contact and finally breaking of the circuit between 5 and 7 owing to the fact that 5 draws away from 7. From this moment the armature l returns from the right to the left towards its position of rest; the circuit is closed again through 5 and 7 which again come in contact whilst I and o are still touching, it is then broken a second time owing to the fact that t withdraws from Q). For each complete oscillation of the armature Z there are therefore four makes and breaks of the circuit of the primary 6. The cycle of operations then recommcnces.

The durations of passage of the current in the primary 6 are governed by the clasticity of the strips 2?, 1, 2, and by the spaces arranged between the contacts 8 and u, t and 0.

Instead of utilizing a lagging electromagnet any form of electromagnet can be used for example a horse shoe magnet.

The number of interruptions of the primary circuitcan be greater than double or quadruple the number of oscillations of the armature as desired.

I declare that what I claim is 1. In an induction coil the combination of a coil having aprimary winding, an electromagnet, a source of current, connecting means between the winding of said electromagnet and said source to form a circuit, connecting means between said primary Winding and said source to form a second circuit and contact means moved by said armature to produce a number of breaks of the primary circuit which is a multiple of the number of breaks of the circuit of said electromagnet.

2. In an induction coil the combination of a coil having a primary winding circuit, an electromagnet, an armature actuated by said elcctromagnet, two fixed contacts con nected with said primary winding circuit, resilient members carrying contacts coopcrating with said fixed contacts and actuated by said armature.

3. In an induction coil the combination of a coil having a primary winding circuit, an electromagnet, an armature actuated by said electromagnet, two fixed contacts corinected with said primary circuit, and six movable contacts actuated by said armature and adapted to make and break contact with said fixed contacts four times during each complete oscillation of said armature.

4. In an induction coil the combination of a coil having a primary winding circuit, an electromagnet, an armature actuated by said clectromagnet, a pair of fixed contacts connected with said primary circuit, a pair of movable contacts resiliently carried by 10 said armature, a pair of resilient members, and two contacts mounted on each member and adapted to contact each with one of the contacts of said pairs.

In testimony whereof I afiix my signature.

ZAOHARIE BISSKY. 

